Calgary
Canada
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Calgary, Canada

A view of the magnificent skyscrapers of the city of Calgary, Canada, on a mildly sunny day
A view of the magnificent skyscrapers of the city of Calgary, Canada, on a mildly sunny day
The first month of the autumn, September, is still a comfortable month in Calgary, Canada, with temperature in the range of an average high of 17.8°C (64°F) and an average low of 4.1°C (39.4°F).

Temperature

In Calgary, the average high-temperature decreases, from an agreeable 22.8°C (73°F) in August, to an enjoyable 17.8°C (64°F). The average low-temperature, in Calgary, is 4.1°C (39.4°F).

Humidity

The average relative humidity in Calgary, Canada, is 44.3%.

Rainfall

In Calgary, Canada, during September, the rain falls for 8.7 days and regularly aggregates up to 41.7mm (1.6") of precipitation. Throughout the year, there are 68 rainfall days, and 326.7mm (12.9") of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall.

Daylight

In Calgary, Canada, the average length of the day is 12.6h.

Sunshine

In September, the average sunshine is 6.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Calgary?

In Calgary, Canada, in September, the average high-temperature is 17.8°C (64°F), and the average low-temperature is 4.1°C (39.4°F).

What is the average humidity in September in Calgary?

In Calgary, the average relative humidity in September is 44.3%.

How much does it rain in Calgary in September?

In Calgary, in September, during 8.7 rainfall days, 41.7mm (1.6") of precipitation is typically accumulated.

When does it start snowing in Calgary?

September is the first month it typically snows in Calgary. Throughout September, in the average 1.3 snowfall days, it receives 39mm (1.5") of snow.

What is the average length of the day in September in Calgary?

In September, the average length of the day is 12.6h.

How many hours of sunshine does Calgary have in September?

In Calgary, the average sunshine in September is 6.9h.

What is the UV index reading in September in Calgary?

In Calgary, Canada, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Calgary, Canada
  • Average high temperature in September: 17.8°C

The warmest month (with the highest average high temperature) is July (23.2°C).
The month with the lowest average high temperature is January (-0.9°C).

  • Average low temperature in September: 4.1°C

The month with the highest average low temperature is July (9.8°C).
The coldest month (with the lowest average low temperature) is January (-13.2°C).

Average humidity in September - Calgary, Canada
  • Average humidity in September: 44.3%

The month with the highest relative humidity is December (55.3%).
The month with the lowest relative humidity is April (40.7%).

Average rainfall in September - Calgary, Canada
  • Average rainfall in September: 41.7mm

The wettest month (with the highest rainfall) is June (93.9mm).
Driest months (with the lowest rainfall) are January and February (0.1mm).

Average rainfall days in September - Calgary, Canada
  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is June (13.8 days).
The month with the lowest number of rainy days is February (0.2 days).

Average snowfall in September - Calgary, Canada
  • Average snowfall in September: 39mm

The month with the highest snowfall is March (227mm).
Months with the lowest snowfall are July and August (0mm).

Average snowfall days in September - Calgary, Canada
  • Average snowfall days in September: 1.3 days

The month with the highest number of snowfall days is March (9.5 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight in September / Average sunshine in September - Calgary, Canada
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 8h).

  • Average sunshine in September: 6.9h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 3.7h).

Average UV index in September - Calgary, Canada
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 0).